noun
- The period of sexual receptivity in female mammals, during which they are fertile and ready to mate; estrus.
Usage: Also spelled 'estrum' in U.S. English; Chiefly used in biology and veterinary contexts; British spelling variant of 'estrum'
Examples
- The mare entered oestrum and was ready for breeding.
- During oestrum, female dogs display behavioral and physical changes.
- Veterinarians monitor oestrum cycles in livestock to optimize breeding schedules.
- The oestrum period typically lasts several days in most mammalian species.
- Hormonal changes trigger the onset of oestrum in female animals.